Keeler offer a wide range of high quality, competitively priced eye care tools designed for everyday, rigorous use. When testing children it is hard to keep their attention throughout the examination. Keeler?s range of children-friendly sight testing products will help you capture their imagination. Thomas The Tank Engine Reading Test Type are designed for keeping the fun in near vision testing. These children test types are tests that keep the fun in near vision testing with colour pictures and easy to follow text that encourage full child participation. Print size N5 to N24.